190 BOTANICAL GAZETTE. [July, 
of the results reached, leaving details for Mr. Thaxter’s paper on the subject, 
which will soon appear in print. 
The spores of Gym. clavipes C. & P. growing on stems of Juniperus Virgin- 
iana were sown on young plants of Amelanchier Canadensis and were followed 
by a luxuriant growth of Restelia aurantiaca Peck. Gym. clavipes was detected 
for the first time on Juniperus communis at Weymouth, Mass., by Mr. J. F. 
Humphrey, and was afterwards found on the same host in another locality by 
Mr. Thaxter, Cultures were also made of the foliicolous Gymnosporangiun, 
which causes the well known bird-nest distortion of J. Virginiana, which is 
stated in my paper on “Gymnosporangia of the United States” to be a form of 
G. clavipes. The shape of the spores and their pedicels, and the fact that they 
nest form to that species. This view is incorrect, and the bird-nest form is 
rather to be referred to G. conicwm DC., and the cultures made by Mr. Thaxter 
sown on Cratcegus tomentosa were followed py Restelia lacerata F r., also agreeing 
with Oersted’s experiments, The cultures of spores of other species of Gymno- 
Fresh fruits of A. grandiflora and A. ygmea, communicated by Mr. Curtiss 
from Florida, clearly show the distinct and rather firm membrane, investing 
the seed and firmly attached at the hilum. I have not been able to study its 
formation and growth, which is still needful.—A. Gray. 
ymnosporangium macropus on Pirus coronaria. —The “cedar ap- 
ples” were gathered from several small trees of Juniperus Virginiana on April 
12th, and before any of the gelatinous masses or “ horns” upon the excrescences 
had made their appearance. The “apples” were placed in water on a plate 
in the laboratory until the spores had germinated and produced their sporidia 
in great abundance. On April 23d, sowings of the sporids were made upon the 
young leaves of the wild crab apple (Pirus coronaria). 
The leaves and tips of branches sown were at once covered with sacs of 
cloth similar to those used in crossing and hybridizing plants. The same num- 
ber of sacs were placed upon tips of twigs on which no Gymnosporangium 
spores had been sown. 
By the method of forcing the growth of the cedar apples by keeping them 
moist and in a warm room, the danger of a previous inoculation of the leaves 
sown was avoided. 
On May 12th Spermagonia were found in abundance in process of forma- 
tion upon the leaves in every instance where sowings had been made. On the 
other hand, not a sign of a fungus was observed on the unsown leaves under 
the sacs or on any other parts of the trees. The success of the inoculation was 
